Zero Carb Health does not advocate Fasting or IF (intermittent fasting) on a Zero Carb Diet. Fasting is beneficial if you are eating a diet that contains carbohydrates. The reason fasting is beneficial is because of the absence of damaging, inflammatory carbohydrates in the body, not the lack of food.

Sugar damages our bodies in many ways. There is no benefit of eating sugar, so eliminating sugar is a huge relief to our bodies. You can read all about the why and how sugar is so damaging in this article by Gary Taubes.